皮皮学，免费搜题
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【单选题】
在( )中，用户—般不直接操纵计算机，而是将作业提交给系统操作员。由操作员将作业成批装入计算机，然后由操作系统按照一定的原则执行作业，并输出结果。最后由操作员将作业运行结果交给用户。A.
批处理操作系统
B.
分时系统
C.
实时系统
D.
网络操作系统
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Because agriculture is so important to a nation's well-being, governments have always been concerned with it. For example, the United States and Canada have long produced surpluses that complicate the...
A.
they throw the country into great disorder
B.
they entail more expenditure on the part of the government
C.
they usually involve direct governmental support price
D.
the government has to set up special pricing systems
【单选题】Farmers have always had a particular interest in the weather, because it ( ) their work.
A.
accelerates
B.
effects
C.
affects
D.
exerts
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