治疗咽喉红肿疼痛,兼有肺热咳嗽痰多者,应首选()
A.射干
B.鱼腥草
C.马勃
D.板蓝根
E.山豆根
参考答案:A
右图船闸中,仅阀门A打开,上游和闸室组成______;船从闸室驶向下游时,需要阀门______关闭,阀门______打开,拦河大坝修成“上窄下宽”的形状是因为液体的压强随深度的增加而______.
If n is an integer, which of the following CANNOT be a factor of 3n+4 ?()
A.4
B.5
C.6
D.7
E.8