ST1-600型闸调器,螺杆一次最大缩短量为()。
A、50mm
B、135mm
C、175mm
D、275mm
参考答案:C
The number of people invited __________ fifty, but a number of them __________ absent for different reasons
A.were ; was
B.was ; was
C.was ; were
D.were ; were
下列关于我国证券交易所的表述中,正确的有 ( )
A.证券交易所是非盈利的经济组织
B.证券交易所参与证券的交易
C.为证券交易提供设施和服务
D.组织监督证券交易、结算和交割
E.对违法违规行为进行处罚