单项选择题

打开正交按钮是_____功能键。
A、F7
B、F8
C、F9

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单项选择题
用HCI滴定NaOH+Na2CO3混合碱到达第一化学计量点时溶液pH约为( )。 A、>7 B、 C、7 D、<5
判断题
Smith College, which was founded in 1871, is the premier all-women's college in the United States. 可以简化为： Founded in 1871, Smith College is the premier all-women's college in the United States. 正确错误
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