圆锥齿轮的标准数量规定在()。
A. 小端
B. 中心端面
C. 大端
D. 以上都不对
其实情绪本身并无是非、好坏之分,每一种情绪都有它的价值和功能。()
A. 正确
B. 错误
志愿者可以参与()开展的志愿服务活动,也可以()开展志愿服务活动。
()the survivors known more of how to cope with cold water in the sinking of MV Titanic in 1912 countless lives().
A. Have/could have been saved
B. Have/could have saved
C. Had/could has saved
D. Had/could have been saved