When visitors get on the coach, the local should check the number of the baggage.
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In the scenic spot,the local guide should give tourists a brief introduction.
A. 对
B. 错
The local guide and tourists should arrive at gathering place at the same time.
A. 对
B. 错
In the Qing dynasty, Nandajie controlled more than 50% financial institutions.
A. 对
B. 错
关于蛋白质的两性反应,以下说法错误的是
A. 蛋白质的两性是指蛋白质在pH值小于7的溶液中呈现酸性,在pH值大于7的溶液中呈现碱性。
B. 蛋白质是两性分子。
C. 所有蛋白质都有固定的等电点。
D. 蛋白质的等电点是可以测定的。