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【单选题】
What is the balance of payments?A.
The balance of payments is a digital table of all the economic transactions between residents of the reporting country and residents of the rest of the world during a given time period.
B.
The balance of payments is a figured table of all the economic transactions between residents of the reporting country and resident of the rest of the world during a given time period.
C.
The balance of payments is a statistical record of all the economic transactions between residents of the reporting country and residents of the rest of the world during a given time period.
D.
The balance of payment is a digital record of all the economic transactions between residents of the reporting country and residents of the test of the world during a given time period.
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【单选题】（单选题）根据《建设工程工程量清单计价规范》（GB50500——2008），建筑物场地厚度在（ ）以内的挖、填、运、找平，应平整场地项目编码列项。
A.
±20cm
B.
±30cm
C.
±40cm
D.
±50cm
【简答题】汽车悬架分非独立悬架和独立悬架两类，独立悬架又分为几种形式？它们各自有何优缺点？
【单选题】（单选题）根据《建设工程工程量清单计价规范》 （GB 50500一2008）， 建筑物场地厚度在 （ ）以内的挖、填、运、找平，应平整场地项目编码列项。
A.
士20 cm
B.
士30 cm
C.
士40 cm
D.
士50cm
【单选题】药材党参的气味特征是
A.
强烈芳香，味苦辛
B.
气微香，味苦，嚼之粘牙
C.
气清香，味甜微辛，嚼之略带黏性
D.
有特殊香气，味微甜
E.
香气特异，味微甘、辛、苦
【简答题】描述某LTI离散系统的差分方程为
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