The main factor which determines the output of each cylinder is （） ["the cylinder weight","the cylinder bore","the cylinder length","the cylinder cover"]
在推动我国风险投资主体多元化上的正确做法是（） ["鼓励有条件的大型企业设立风险投资部门","鼓励大型金融机构进入风险投资业","逐步减少政府资金在风险投资业所占比例","陆续出台鼓励天使投资的政策"]
When a tug is pulling on a hawser at right angles to the ship，and the pilot wants to come ahead or astern on the ship’s engine，care must be taken that the pilot（）. ["does not break the towline","does not get too much way on the vessel","keeps a steady course so the towline will remain tight","turns the ship toward the direction of pull"]
用显微镜进行观察时，如果转动物镜和移动玻片标本都未能把视野中的污点移走，那么可以断定，污点在（） ["目镜上","物镜上","反光镜上","玻片标本上"]
什么是寄生虫性栓塞？
请问何谓涡流制动，有什么优点？
