在起重吊装中,钢丝绳用作缆风绳时,其安全系数应不小于()。
A.3.5
B.5
C.8
D.10
参考答案:A
(2013·郑州一模)—Did you tell her the bad news?
—Yes, but I'd rather ________.
A.didn't
B.not
C.not have
D.hadn't
家族性Alzheimer病为()
A.常染色体显性遗传
B.常染色体隐性遗传
C.性连锁显性遗传
D.性连锁隐性遗传
E.遗传方式未定