background:url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层() A: 2、png B: 1、jpg C: 3、png D: 4、jpg

某类型元件的寿命X(以小时记)服从[img=65x27]1802d3c77ce2e1f.png[/img]，[img=11x18]1802d3c785a492a.png[/img]和[img=18x22]1802d3c78e0680c.png[/img]均未知。现随机抽测9个元件，测得样本均值为400，样本标准差为9，在置信水平为95%下,以下说法哪个是正确的？ A: [img=11x18]1802d3c7971ed93.png[/img]的双侧置信区间为(393.08,406.92) B: [img=11x18]1802d3c7971ed93.png[/img]的单侧置信下限为394.42 C: [img=11x18]1802d3c7971ed93.png[/img]的单侧置信上限为405.58 D: [img=11x18]1802d3c7971ed93.png[/img]的双侧置信区间为(393.21,406.79)‍ E: [img=11x18]1802d3c7971ed93.png[/img]的单侧置信下限为394.50‍ F: [img=11x18]1802d3c7971ed93.png[/img]的单侧置信上限为405.50‍ G: [img=11x18]1802d3c7971ed93.png[/img]的双侧置信区间为(394.12,405.88) H: [img=11x18]1802d3c7971ed93.png[/img]的单侧置信下限为395.07 I: [img=11x18]1802d3c7971ed93.png[/img]的单侧置信上限为404.94

ED WEQWERQWRQWRQWR A: 1 B: 2 C: 3 D: 4

ask(ed) A: want(ed) B: pleas(ed) C: carri(ed) D: help(ed)

﹙1000100101110101﹚8421BCD对应的十进制数为﹙ ﹚ A: 8561 B: 8975 C: 7AD3 D: 7971

/ananas/latex/p/1802

根据发音规则，找出每组中发[æ]的单词。 A: at B: ed C: face D: sport

8421BCD码1000100101110101对应的十进制数为 A: 8561 B: 8975 C: 7AD3 D: 7971

I got 1.bor(-ed, -ing) last time during the lection because the topic was totally not 2. interest(-ed, -ing) for me, it was honestly 3. tir(-ed, -ing) to be there for me.Where do you need an -ed prefix for adjectives here？ A: 1，2 B: 3 C: 4 D: 1

可靠安全系数是指（） A: LD/ED B: ED/LD C: LD/ED D: LD/ED E: ED/LD