不属于内分泌腺的是()
A.肾上腺
B.甲状腺
C.垂体
D.舌下腺
E.松果体
参考答案:D
Many new workers _____ trained and in two months they will _____ to build a new railway.
A.are; be sending
B.are being; be sent
C.are; send
D.will be; be to send
10kV、400V系统电源切换进行倒闸操作时,应(),严防交流系统()。