将反应[img=212x26]17de9319b2be361.png[/img]构成原电池，其电池符号为：
未知类型：{'options': ['(-)[img=37x22]17de9319c045c46.png[/img]∣[img=37x22]17de9319cde3f34.png[/img]‖[img=34x25]17de9319db5c096.png[/img]∣[img=23x23]17de9319e86e2a1.png[/img](+)', '(-)[img=19x19]17de9319f66d6fd.png[/img]∣[img=37x22]17de9319c045c46.png[/img]∣[img=37x22]17de9319cde3f34.png[/img]‖[img=34x25]17de9319db5c096.png[/img]∣[img=23x23]17de9319e86e2a1.png[/img](+)', '(-)[img=19x19]17de9319f66d6fd.png[/img]∣[img=37x22]17de9319c045c46.png[/img],[img=37x22]17de9319cde3f34.png[/img]‖[img=34x25]17de9319db5c096.png[/img]∣[img=23x23]17de9319e86e2a1.png[/img](+)', '(-)[img=19x19]17de9319f66d6fd.png[/img]∣[img=37x22]17de9319c045c46.png[/img],[img=37x22]17de9319cde3f34.png[/img]‖[img=34x25]17de9319db5c096.png[/img]∣[img=23x23]17de9319e86e2a1.png[/img]∣[img=19x19]17de931a0497147.png[/img](+)'], 'type': 102}
未知类型：{'options': ['(-)[img=37x22]17de9319c045c46.png[/img]∣[img=37x22]17de9319cde3f34.png[/img]‖[img=34x25]17de9319db5c096.png[/img]∣[img=23x23]17de9319e86e2a1.png[/img](+)', '(-)[img=19x19]17de9319f66d6fd.png[/img]∣[img=37x22]17de9319c045c46.png[/img]∣[img=37x22]17de9319cde3f34.png[/img]‖[img=34x25]17de9319db5c096.png[/img]∣[img=23x23]17de9319e86e2a1.png[/img](+)', '(-)[img=19x19]17de9319f66d6fd.png[/img]∣[img=37x22]17de9319c045c46.png[/img],[img=37x22]17de9319cde3f34.png[/img]‖[img=34x25]17de9319db5c096.png[/img]∣[img=23x23]17de9319e86e2a1.png[/img](+)', '(-)[img=19x19]17de9319f66d6fd.png[/img]∣[img=37x22]17de9319c045c46.png[/img],[img=37x22]17de9319cde3f34.png[/img]‖[img=34x25]17de9319db5c096.png[/img]∣[img=23x23]17de9319e86e2a1.png[/img]∣[img=19x19]17de931a0497147.png[/img](+)'], 'type': 102}
举一反三
- 已知随机变量X的分布列如下：[img=386x130]17e43ec4c459e73.png[/img]，则E(X)= A: 17/30 B: m未知，无法求出 C: -30/17 D: -17/30
- 求不定积分[img=132x48]17da6537fc8dad6.png[/img]； （ ） A: -(4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) B: (4*(sin(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) C: (4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) D: (4*(cos(x/2)/2 + 2*cos(x/2)))/(17*exp(2*x))
- 令F(x):x是有理数,G(x):x是实数。将命题“所有的有理数都是实数,但有的有实数不是有理数”符号化为() 未知类型：{'options': ['17e0a83a4157352.jpgx(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))'], 'type': 102}
- 已知直线DE与平面P、ABC平行，求de、d'e'.[img=382x414]17e4438c9b183d9.png[/img] 未知类型：{'options': ['', ' [img=408x441]17e4438cb2384bd.png[/img]', ' [img=425x404]17e4438cbcd417a.png[/img]', ' 以上均不对'], 'type': 102}
- X，Y相互独立，X服从参数为2的泊松分布，Y服从[img=54x25]1803b4181e39f0c.png[/img]，则[img=84x25]1803b4182602fd0.png[/img]与[img=86x25]1803b4182e0ab99.png[/img]分别为 A: -1，-7 B: 1, -7 C: 1，17 D: -1, 17