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【多选题】
直接浇口适用于各类塑料的注射成型,尤其对_有利?A.
结晶性或易产生内应力的塑料
B.
热敏性塑料
C.
流动性差的塑料
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【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】I ________ your house, so I thought I' d stop by for a chat. [A] pass [B]had passed [C]have passed [D] was passing
【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
【简答题】细菌的遗传物质主要有 、 等
【单选题】As Prof. Hoffmann describes, the first World War was controversial even________. It is known for being a very, very nasty war where lots of lives were lost and soldiers died of disease and fighting in...
A.
in Africa
B.
in Asia
C.
in Oceania
D.
in Europe
【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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