外感咳嗽以下列何邪为先导而夹它邪()
A.风邪
B.寒邪
C.热邪
D.燥邪
E.湿邪
参考答案:A
Some experts have said that ________ children believe they can succeed, they will never become totally confident of themselves.
A.if
B.since
C.once
D.unless
在梁的整体稳定计算中,φb不等于______时,为梁弹性和弹塑性工作的分界点。