岩浆侵入引起的煤层厚度变化是原生变化。()
参考答案:错
He is a ______ and he can cook ______ food.[ ]
A. cook, French
B. cook, France
C. cooker, French
D. cooker, France
“可贷资金模型”的代表人物是( )。
A.罗伯逊和俄林
B.李嘉图和俄林
C.赫克歇尔和俄林
D.李嘉图和赫克歇尔