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【判断题】
从事电焊的工作人员，应了解所操作焊机的结构和性能，能严格执行安全操作规程，正确使用防护用品，并掌握触电急救的方法。（）A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】CAE
【单选题】Object 1 has twice the mass of Object 2. Both objects have the same kinetic energy. Which of the following statements is true?
A.
Both objects can have the same magnitude of momentum.
B.
Object 1 has a momentum of greater magnitude than Object 2.
C.
The magnitude of the momentum of Object 2 is four times that of Object 1.
D.
All the statements are false.
E.
All the statements are true.
【单选题】Object 1 has twice the mass of Object 2. Each of the objects has the same magnitude of momentum. Which of the following statements is true?
A.
Both objects can have the same kinetic energy.
B.
One object has 0.707 times the kinetic energy of the other.
C.
One object has twice the kinetic energy of the other.
D.
One object has 4 times the kinetic energy of the other.
E.
None of the others.
【单选题】— Has the little girl passed ______ P.E．test? — She has tried twice, and the teacher will allow her to have _____ third try.
A.
the; 不填
B.
a; the
C.
the; a
D.
the; the
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