吊装构件前，抱杆（）部应向受力（）侧适度预倾斜。
A.顶；一
B.顶；反
C.底；一
D.底；反
参考答案：B
Eric fell ill suddenly but was so foolish. He didn't even have ________ common sense to send for ______ doctor.
A．the; the
B．a; the
C．the; a
D．a; a
锅炉缺水后会出现哪些现象？
