设u(x),v(x)在x=0处可导,且u(0)=1,u"(0)=1,v(0)=2,u'(0)=2,则().
A.-2
B.0
C.2
D.4
参考答案:D
解析:
– Really? Who will give_____ lecture? What is it about?
--- Professor Chen,_____ president of Beijing University. About pollution.
A the, a B the, ∕ C a, the D a, ∕
在圈闭内聚集了足够数量并具有同一压力系统的天然气,就形成了()。
A、油气藏
B、油藏
C、气藏
D、气田