The lecture was so_____ that everyone went to sleep.
The lecture was so\_\_\_\__ that everyone went to sleep.
应选
要求放大电路取用信号源的电流小，而且输出电压稳定，应选（ ）负反馈。
要求放大电路取用信号源的电流小，而且输出电压稳定，应选（ ）负反馈。C
The manager said that there were two reasons _____ our sales dropped sharply last year.
The manager said that there were two reasons \_\_\_\__ our sales dropped sharply last year.
某酯水解生成甲和乙两种物质，在同温同压下，相同质量的甲和乙的蒸气占有相同的体积，则该酯的结构简式为（ ）．
某酯水解生成甲和乙两种物质，在同温同压下，相同质量的甲和乙的蒸气占有相同的体积，则该酯的结构简式为（ ）．
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