罩面石膏灰不得抹在（）层上。
A.石灰砂浆
B.水泥石灰砂浆
C.防水砂浆
D.水泥砂浆
参考答案：D
I don't understand what the engineer means, but I've got _____ rough idea of _____ project plan.[ ]
A. the; a
B. 不填; the
C. the; 不填
D. a; the
汽轮机启动过临界转速时，振动（）应打闸停机。
A.超过0.1mm
B.超过0.05mm
C.超过0.03mm
D.超过0.12mm
