题目内容

【单选题】Question 7: What did the firefighters’ representative tell the local TV?

A. It was a long time before the cleanup was finished.
B. It was a hard task to remove the spilled substance.
C. It was fortunate that no passenger got injured.
D. It was difficult to contact the manufacturer.

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改变直流电机两端的电压极性,电机会有什么现象?

A. 停止
B. 反转
C. 转速变快
D. 转速变慢

病毒的大小以__________计。病毒的化学组成有__________和________,个别大的病毒还有__________和________。

病毒的繁殖过程包括___________、____________、__________和________。

病毒的蛋白质衣壳和核酸内芯两者构成________。

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