“维规”规定:无线列调设备的倒修数量配备,机车台当运用数在50台以下时,按实际应用数的()配备.
A.50%
B.20%
C.30%
参考答案:C
如果该患者的两对半检测结果为:HBsAg(-),抗HBs(+),HBeAg(-),抗HBe(-),抗HBc(-),则表示()
A.曾有HBV感染,现已完全恢复
B.乙型肝炎感染急性期
C.乙型肝炎感染恢复期
D.乙型肝炎既往感染
E.有过乙型肝炎感染,现无免疫力
A tide is called diurnal when().
A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day