隐性流产的诊断中，一般可用于早孕或者胚胎死亡诊断的是()
A. hCG测定
B. 早孕因子EPF的测定
C. FSH
D. LH
E. OT
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Which of the following problems will occur if a disk-type centrifugal lube oil purifier is
A. Contamination of the lube oil by emulsification will result
B. The lube oil will not be subjected to the proper centrifugal force
C. The lube oil will overheat and flash
D. Oil will discharge from the heavy phase discharge port and be wasted
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