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【单选题】
关于视图的描述下面说法哪些是正确的:A.
数据库即存储视图的定义也存视图的数据.
B.
用带有聚集运算的SQL创建的视图是可更新视图
C.
用带有group by字句的SQL创建的视图是可更新视图
D.
视图可以能在多个关系上创建
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】______ acts as a storage tank to send refrigerant to the expansion valve at all times.
A.
Evaporator
B.
The Receiver Dryer
C.
Condenser
D.
Compressor
【单选题】期权是一种按约定价格在未来的特定时间内买进或卖出一定数量特定资产的选择权，为了获得该权利，
A.
买卖双方都需要向对方支付权利金
B.
买方需要向卖方支付权利金
C.
卖方需要向买方支付权利金
D.
是否需要向对方支付权利金由双方协商决定
【单选题】As is the heart of the air conditioning system, ______is a belt driven pump that is fastened to the engine.
A.
the condenser
B.
the compressor
C.
the evaporator
D.
the receiver dryer
【单选题】The Receiver Dryer acts as a storage tank to send refrigerant to the ______ at all times.
A.
evaporator
B.
expansion valve
C.
condenser
D.
compressor
【单选题】As the heart of the air conditioning system, ______is a belt driven pump that is fastened to the engine.
A.
the condenser
B.
the compressor
C.
the evaporator
D.
the receiver dryer
【单选题】What is of the greatest importance to a football team is______.
A.
its members
B.
its team work
C.
the football field
D.
the climate
【单选题】Expansion valve can sense both temperature and pressure, and is very efficient at regulating refrigerant to the ______.
A.
evaporator
B.
receiver dryer
C.
condenser
D.
blower
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