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【单选题】
以下哪种资料收集方法,无法取得初级资料?A.
观察法
B.
文献回顾法
C.
访谈法
D.
实验法
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】水文气象、主机转速等详细信息 III 航迹上的时间标记 IV 至少显示过去12小时的历史航迹 V 历史航迹选择显示452
A.
Ⅰ II IV
B.
I III IV
C.
III IV
D.
II～Ⅵ
【简答题】在纯水中,H + 浓度 OH - 浓度。(填“大于”、“小于”或等于)
【单选题】水文气象、主机转速等详细信息 III 航迹上的时间标记 IV 至少显示过去12小时的历史航迹 V 选择显示过去某时段的航迹453
A.
Ⅰ II IV
B.
I III IV
C.
III IV
D.
II～Ⅵ
【单选题】The author' s main concern in this .passage is to______
A.
point out the role the workaholic plays in the American economy.
B.
defend people who are addicted to work.
C.
encourage us not to worry about our imperfection.
D.
consider the difficulties that confront us at middle-age.
【单选题】听力原文：M: As a means of international settlement, what is the main role of a credit card? W: Its main role is to transfer the payment obligation from payer to bank. It makes the payment safer for the ex...
A.
It is to transfer the contract from bank to customer.
B.
It is to transfer the payment obligation from buyer to seller through banks.
C.
It is to transfer the confirmation from the issuing bank to confirming bank.
D.
It is to transfer the documents from advising bank to issuing bank.
【单选题】The main idea of this passage is ______.
A.
the destructive role of utter pessimism
B.
achieving success regardless of criticism
C.
no cracking down, no building up
D.
one should learn to handle stresses
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