我国货币层次中的M0即现钞不包括商业银行的库存现金,而是指居民手中的现钞和企业单位的备用金。()
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精馏塔加料板以下的部分称为提馏段。
A. 正确
B. 错误
During working, thermostatic expansion valve should be ().
A. either all the way open or all the way closed
B. normally fully open
C. throttled depending on load
D. controlled by liquefied pressure