下列溶剂中能耗小,溶解能力强,选择性好的溶剂是()。
A、三乙醇溶剂
B、二甲基亚砜
C、环丁砜
参考答案:C
34.Whether age is happy or unpleasant depends less on money or on health than______ on your ability to have fun.
A.it is
B.it does
C.it did
D.it was
鉴别良恶性溃疡的最重要方法是( )
A.溃疡大小B.大便潜血C.胃液分析D.胃黏膜组织病理学检查E.幽门螺杆菌(Hp)检查