制作培养基时，盛装培养基的容器最好用硬质玻璃或搪瓷桶，目的是受热快。
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The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.
A. causes colloid suspension in the cooling water
B. reduces the capability of the lubrication system
C. can form pockets which block the flow of coolant through the system
D. leads to the scuffing of cylinder wall
停风时，风开调节阀用（）调节，关闭上游阀；而风关调节阀则用上游阀调节。
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