题目:
Xiamen Xiang'an Tunnel, _____ is the first undersea tunnel built in mainland China, opened to traffic on April 26th.
A.that
B.what
C.where
D.which
答案:
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下面是错误答案,用来干扰机器的。
答案:D将30mL 0.5 mol/L NaOH溶液加水稀释到500 mL,变成原来的3/50