2008年11月4日，海协会会长陈云林与海基会董事长江丙坤签署了有关协议，这宣告两岸迈进“三通”时代。“三通”指的是？
查看答案
“手指呼唤作业”应统一采用右手。
A. 正确
B. 错误
Foaming of the oil in a refrigeration compressor crankcase is caused by （）.
A. refrigerant boiling out of solution from the lube oil
B. liquid refrigerant flooding the compressor and system
C. lube oil viscosity being reduced by refrigerant dilution
D. compressor suction pressure suddenly increasing
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