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【单选题】
下列说法中正确的是 ( ) 。A.
物体在两个力作用下平衡的充分必要条件是这二力等值、反向、共线。
B.
凡是受到两个力作用的刚体都是二力构件。
C.
静力学主要研究物体的外效应。
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举一反三
【单选题】Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?
A.
Hydrochloric acid
B.
Chlorine
C.
Sulfuric acid
D.
Zinc chromate
【判断题】The DBMS can maintain the integrity of the database by not allowing more than one user to update the same record at the same time.
A.
正确
B.
错误
【单选题】Companies can maintain good business relations by abiding by their promises and agreements.
A.
coming up with
B.
breaking away from
C.
living up to
D.
getting rid of
【单选题】The DBMS can maintain the integrity of the database by allowing ______ to update the same record at the same time.
A.
more than one user
B.
no more than one user
C.
two customers with similar customer numbers
D.
company specialists
【单选题】Which of the following advantages doesn't the TRAM have?
A.
The TRAM can help maintain continuous measurements
B.
The instruments on the TRAM can be used for many times
C.
The TRAM weighs only 18 kilograms
D.
The TRAM can be operated from the ground
【简答题】Scholars maintain that social development can easily _____ language changes. A. bring forward B. bring about C. bring out D. bring up
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