提升机更换钢丝绳作业时,必须在提升机()配合操作。
参考答案:机械室
—Every day, my mother tries to spare some time to chat with me, she is very tired after a whole day’s hard work.
—You are lucky to have such a great mum!
A.unless
B.whether
C.although
D.until
绿鳍马面鱼屯属于()目,牙鲆属于()目。