求出O、△、口所代表的数.一:口+O=43,口+△=48,O+△=55.口=(),O=(),△=().

This program will operate at（） A: 9 o’clock Monday night B: 19 o’clock Monday night C: 9 o’clock Sunday night

以下哪种情况应优先采取措施？（） A: S=9，O=3，D=3 B: S=3，O=9，D=3 C: S=3，O=3，D=9

以下哪种情况应优先采取措施___。 A: S=9、O=3、D=3 B: S=3、O=9、D=3 C: S=3、O=3、D=9 D: S=5、O=8、D=8

Tom ____（go） to school at 9 o’clock yesterday morning.

中国大学MOOC: 已知x=43 ,ch=’A’,y=o;则表达式(x>=y&&ch<’B’&&!y)的值是（ ）

下列路由表信息中，错误的路由表项是（）。 A: C 212.112.7.0/24 is directly connected，212.112.7.1 B: S 167.105.125.128[1/0]via 202.112.7.1 C: O 222.29.2.0/24[110/3]via 162.105.1.145,00:13:43,Vlanl D: O E1 202.37.140.0/28[110/22]via 162.105.1.145,00:13:43,Vlanl

【单选题】78+()=43+() A. 78   43 B. 43   43 C. 43   78

lesson 18 Directions: in this part, you are going to listen to five transmissions or short exchanges and choose the correct answer from four choices. A: 9 miles 6 o’clock 9000feet fast moving from left to right B: 9 miles 6 o’clock 9000feet crossing from right to left C: 6 miles 9 o’clock 9000feet fast moving from right to left D: 6 miles 9 o’clock 9000feet crossing from left to right

The hotel serves breakfast at the following time EXCEPT (). A: 6 o’clock. B: 7:30 a.m. C: 9 o’clock. D: 10 o’clock.