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【单选题】
5 3. 属于弱电解质的是( )。A.
HCl
B.
NaCl
C.
HAc
D.
NaAc
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参考解析：
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【单选题】招标单位与中标单位应自（ ），根据招标文件和中标单位的投标文件订立书面合同。
A.
招标单位发出中标通知书之日起30天内
B.
中标单位收到中标通知书之日起30天内
C.
招标单位发出中标通知书之日起28天内
D.
中标单位收到中标通知书之日起28天内
【单选题】听力原文： A farmer who lived in a small village suffered from the severe pain in his stomach. The doctor in the village had tried a number of treatments but been unable to cure him. The farmer decided to ...
A.
He wanted to pay less money.
B.
The town was not far from his home.
C.
The doctor in the village failed to cure him.
D.
The doctor in the village refused to treat him again.
【简答题】中标单位:
【简答题】根据下列材料请回答 50～49 题： 第 50 题 Why did Leila lie under her car on the stomach? （ ）
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