After she had the report (type) ________, she put it on the director’s desk. (短语结构)
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If you had asked him again, he might (change) ________ his mind. (虚拟语气)
()不是造成数控系统不能接通电源的原因。
A. RS-232 接口损坏
B. 交流电源无输入或熔断丝烧损
C. 面铣刀
D. 直流电压电路负载短路
根据操作方式的不同,液体深层发酵主要有()、()和()三种类型