钢丝绳外层绳股的钢丝表面的磨损，是由于它在（）作用下与滑轮和卷筒的绳槽接触摩擦造成的

“不定形”征见于（）

A.肝脏亚急性血肿

B.肝囊肿

C.原发性肝癌

D.肝脏血管瘤

E.肝腺瘤

Your project is executed with a globally spread virtual team. The project progress has been found to be too slow. Which measure is most likely to immediately speed up the project ？（）

A．Technical training for all team members

B．Daily phone conferences and detailed reporting

C．A team meeting at a location convenient to all team members

D．Collocation of team members at a suitable place

“音乐巨人”是指（），他是哪国作曲家（）

A.贝多芬、德国

B.莫扎特、奥地利

C.海顿、德国

D.舒曼、德国

在图示电路中，3A电流源供出的功率为（）

A.-21W

B.21W

C.18W

D.-18W

双壳体筒形离心泵属于（）。

A.单吸泵

B.单级泵

C.多级泵

D.双吸泵