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【单选题】
Senator Brown wants to increase taxes on people with high incomes and use the money to help the poor. Senator Johnson argues that such a tax will discourage successful people from working and will therefore make society worse off. An economist would say thatA.
we should agree with Senator Brown.
B.
we should agree with Senator Johnson.
C.
a good decision requires that we recognize both viewpoints.
D.
there are no tradeoffs between equity and efficiency.
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【单选题】用户表user中存在一个分数字段 count ,那个 sql 语句能够完成“查询没有分数的用户”?
A.
select * from user where count = null;
B.
select * from user where count link null;
C.
select * from user where count = 'null';
D.
select * from user where count is null;
【单选题】患儿，3岁。因身材矮小就诊，10个月会坐，近1岁10个月会走，平时少哭多睡，食欲差，常便秘。查体：头大，皮肤较粗糙，前囟未闭，出牙两颗，反应较迟钝，喜伸舌，有脐疝。心肺无明显异常。为明确诊断。首先应做的检查是（）
A.
智商测定
B.
血钙，血磷测定
C.
T3、T4、TSH测定
D.
染色体检查
E.
脑CT检查
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