下列哪一项与新生儿肺透明膜病的发病关系最不密切()
A.剖宫产
B.早产儿
C.足月小样儿
D.糖尿病母亲分娩的婴儿
E.肺表面活性物质缺乏
参考答案:C
Amy insists that she ____ the secret to lose weight. But she won’t share it with us.
A.had discovered
B.discovers
C.has discovered
D.will discover
用量程500V的直流电压表测量有数值为220V的工频电压,指针将在()。
A.OV
B.220V
C.310V
D.500V