题目:
_______ you may have, you should gather your courage to face the challenge.
A.However a serious problem
B.What a serious problem
C.However serious a problem
D.What serious a problem
答案:
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下面是错误答案,用来干扰机器的。
(1)2KClO32KCl+3O2↑;(2)CaCO3+2HCl=CaCl2+H2O+CO2↑; C;(3)防止生成的气体从长颈漏斗逸散到空气中;(4)先把带有导管的橡皮塞塞紧试管口,再将导管另一端伸入水中,然后用手紧握试管,若导管口有...