收益率在证券质押式回购交易中对于以券融资方面而言，代表其固定的收益，对于以资融券方而言，是固定的融资成本。()
查看答案
Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.
A. gears
B. rams
C. barrels
D. cam
A vessel must proceed at a safe speed（）.
A. in restricted visibility
B. in congested waters
C. during darkness
D. at all time
吸烟对人的心理健康产生消极影响中不包括（）
A. 自制力变差
B. 注意力涣散
C. 记忆力减退
D. 反应迟钝
微信支付 
支付宝支付