【单选题】The political wisdom of choosing a tariff acceptable to the median U.S. voter is
A.
a good example of the principle of the second best.
B.
a good example of the way in which actual tariff policies are determined.
C.
a good example of the principle of political negotiation.
D.
not evident in actual tariff determination.
E.
usually evident in actual tariff determination.
【单选题】( )是世界上最大的露天博物馆,有“宫殿之城”的美誉。P343
【判断题】客人要求加床时,客房部工作人员有权给客人直接加床。
【单选题】According to the author, which of the following statements is true?
A.
Wisdom may be developed with life experience.
B.
People will lose mental skills together with wisdom.
C.
Wisdom is superior in importance to mental aging.
D.
Wisdom is inferior in importance to mental aging.
【判断题】缓冲蛋白胨水是基础培养基,不含任何抑菌成分。
【单选题】某标准直齿圆柱齿轮,已知齿距 p =12.56mm,齿数 z =20,正常齿制, π ≈ 3.14 , 则模数 m=( ) mm
【单选题】某标准直齿圆柱齿轮,已知齿距 p =12.56mm,齿数 z =20,正常齿制, 模数 m= 4 mm ,则 齿顶圆直径 d a = ( ) mm , 齿根圆直径 d f = ( ) mm 。
【单选题】某标准直齿圆柱齿轮,已知齿距 p =12.56mm,齿数 z =20,正常齿制 , 则模数 m= 4 mm , 分度圆直径 d ( ) mm
【单选题】______ is a great virtue.