问题
选择题
________ tourists come to visit Wuxi every year. [ ]
A. Thousands
B. One thousand of
C. Thousands of
D. Two thousands
答案
答案：C
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________ tourists come to visit Wuxi every year. [ ]
A. Thousands
B. One thousand of
C. Thousands of
D. Two thousands
答案：C
短周期元素X、Y、Z、M、R在周期表中的相对位置如图所示。下列说法正确的是
| X | Y | ||||
| Z | M | R | |||
B．原子半径的大小顺序为：r(R)>r(M)>r(Z)
C．元素的最高价氧化物对应水化物的酸性R强于M
D．离子R-和Z 3+的电子层结构相同