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【单选题】
下列泵中属于回转式容积泵的是________。A.
．离心泵
B.
泵
C.
旋涡泵
D.
轴流泵
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反馈参考答案：
举一反三
【简答题】薄膜式热电偶是用真空蒸镀、离子镀或磁控溅射的方法,把热____极材料蒸镀在很薄的绝缘基板(陶瓷片或云母片)上,两种____同的金属薄膜形成了热电偶。测量端既小又薄,热容量____,响应速度____,便于敷贴。适用于测量微____面积上的瞬变温度,以及微波的功率测量等。
【单选题】To make a refund request, the buyer should __________.
A.
prove the product is not as good as described
B.
tell the seller about the refund request in advance
C.
deliver the purchase package to the store
D.
send the product to the seller in good condition
【单选题】To make a refund request, the buyer should .
A.
prove the product is not as good as described
B.
tell the seller about the refund request in advance
C.
deliver the purchase package to the store
D.
Send the product to the seller in good condition
【简答题】细胞内液绝大部分存在于（ ）
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