培养土配制的原则之一是()。
A、容重1~1.5,通气孔隙<10%
B、容重<1,通气孔隙>15%
C、容重>2,通气孔隙>20%
D、容重和通气孔隙越大越好
参考答案:B
We are looking forward to _________ a chance to watch the opening ceremony of Shanghai World Expo.
A.give
B.be given
C.being given
D.Giving
产后郁冒,属产后哪项之一?()
A."三冲"
B."三急"
C."三病"
D."三禁"
E."三审"