起重机失稳时倾翻线取决于吊重时吊臂的方位。（）A、正确 B、错误

He ________ the club and ______ a lot of its activities in his spare time.[ ]

A. took part in; joined                

B. joined; took part in

C. joined; took a part in                

D. took part in; took part in

色谱外标法的准确性较高，但前提是仪器的稳定性高且操作重复性好。( )

清瘟败毒饮用药由白虎汤、黄连解毒汤、犀角地黄汤加减衍变而成。

托收承付承付货款的方式有哪两种？

发动机温度过高，会使润滑油（），降低润滑作用。

A.变稀

B.变稠

C.氧化变质

D.烧损