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【单选题】
使用电动吸吸痰时,吸出液不能超过瓶内容量的A.
3/4
B.
2/3
C.
1/2
D.
1/4
E.
1/5
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【简答题】细菌的遗传物质有 、 。
【单选题】She was just about to explain ___ she hadn't passed her maths test chiefly out of carelessness ___ her uncle came.
A.
her mother … when
B.
to her mother why … that
C.
her mother that … when
D.
to her mother that … when
【简答题】_______________________, we went swimming inthe river. A) The day being very hot B) Itwas a very hot day C) The day was very hot D) Being a very hot day
【单选题】Her birthday had just passed,_________by all but herself.
A.
understood
B.
unnoticed
C.
unshaken
D.
unsaid
【简答题】细菌的遗传物质主要有 、 等
【单选题】Being a very ___________ father, he felt very unhappy when he learned his daughter was going to get married.
A.
possessive
B.
possession
C.
position
D.
positive
【简答题】在带宽为20Mbps、距离为5km的信道上用协议3传输数据帧,电信号在线路上的传播速度约为5 s/km,确认帧长度忽略,当信道利用率为50%时,帧长为____。
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