我国变压器制造行业是从20世纪90年从瑞士引进煤油汽相干燥技术和成套设备。
参考答案：错
— Are you in a hurry?
— No, in fact, I've got plenty of time. I _______ wait. [ ]
A. can
B. may
C. must
D. should
药品贮藏各库房的相对湿度应保持在（）
A.45%～60%
B.45%～75%
C.60%～75%
D.50%～75%
E.55%～75%
