甲杓肌收缩时使声带
A.缩短
B.张力增强
C.松弛
D.内收
E.外展
参考答案:C
A lot of coal miners died on the job last year, _______ the local government to shut nearly 500 small mines in Shanxi Province alone.
A.forcing
B.to force
C.forced
D.has forced
改性沥青密封材料专用于屋面与地下工程接缝的密封,还可用于门窗等的密封。( )