下列哪项为寒凝心脉型胸痛的主要特征()
A.胸部刺痛,固定不移
B.胸痛彻背,感寒痛甚
C.胸痛灼热,烦闷不适
D.胸中闷痛,心悸不宁
E.胸痛咳喘,烦闷发热
参考答案:B
I really appreciate _______ to help me out.
A.you for lending me the money
B.your lending me the money
C.you to lend me the money
D.it that you lend me the money
构成染色体的基本*单位是().
A.DNA
B.核小体
C.螺线管
D.超螺线管