不定项选择

运输服务价格是指在途运费加上提供额外服务的所有附加费或运输端点费用

A．错误
B．正确

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单项选择题

多滑移时所产生的滑移带常呈波纹状。
A、正确
B、错误

单项选择题

What is wrong in the following statement ( )

A．The dipole moment of a monatomic molecule is equal to zero
B．The greater the bond moment, the greater the dipole moment of the molecule
C．The dipole moment of molecule with a center of symmetry is equal to zero
D．The dipole moment of the molecule is equal to the vector sum of the bond moments