单项选择题

A2 题型患者,女性,53岁,主诉尿急、尿频、尿痛。为明确诊断需留取中段尿做尿培养,留取的尿量应不少于
A、2ml
B、5~10ml
C、12ml
D、15ml
E、20ml

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单项选择题

When the price rises from P1 to P2, which of the following statements is not true?
A、The buyers who still buy the good are worse off because they now pay more.
B、Some buyers leave the market because they are not willing to buy the good at the higher price.
C、Buyers place a higher value on the good after the price increase.
D、Consumer surplus in the market falls.

单项选择题

在两绝缘介质的分界面上，其边值关系为（）。
A、且；
B、且；
C、且；
D、且。