— Is he from America?
— _____. [ ]
A. Yes, he does
B. No, he doesn't
C. Yes, he is
答案:C
在不耐蚀的金属中加入()稳定性高的合金元素,提高了金属的耐蚀性。
A.电化学
B.热力学
C.耐湿热
D.耐大气
称为"水谷气血之海"的是()
A.脾
B.胃
C.大肠
D.小肠
E.三焦