金属型铸造的不足之处在于：不透气，导热快，无退让性等等。
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How many types of booth do you know?
A. standard booth
B. peninsula booth
C. island booth
D. linear booth/in-line booth
It is a good choice for us to choose the venue which provides convinient transportation.
A. 对
B. 错
一测站水准测量后视读数小于前视读数，则
A. 后视点高程高于前视点高程
B. 后视点高程低于前视点高程
C. 后视点高程等于前视点高程
D. 无法比较后、前视点高程
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