机车在运行中或()前,严禁()操作。
参考答案:机车未停稳、换向
Both teams were in hard training, ____was willing to lose the game.
A.either
B.neither
C.another
D.the other
芽枯病是由于缺()。
A.钼
B.钙
C.硼
D.铁