【单选题】根据《旅游安全管理办法》规定,四级风险的,旅行社应当( )。
【单选题】根据《旅游安全管理办法》规定,三级风险的,旅行社应当( )。
【单选题】加工点缀花一般以( )、具有可塑性的原料为宜。
【单选题】铜 - 锌原电池表达式是哪一个?
A.
Cu│CuSO 4 ( 1mol/L ) ┊┊ ZnSO 4 ( 1mol/L ) │Zn
B.
ZnSO 4 ( 1mol/L ) │Zn ┊┊ Cu│CuSO 4 ( 1mol/L )
C.
CuSO 4 ( 1mol/L ) │Cu ┊┊ Zn│ZnSO 4 ( 1mol/L )
D.
Zn│ZnSO 4 ( 1mol/L ) ┊┊ CuSO 4 ( 1mol/L ) │Cu
E.
Zn│CuSO 4 ( 1mol/L ) ┊┊ ZnSO 4 ( 1mol/L ) │Cu
【单选题】用对消法测得原电池 Zn│ZnSO4(a1)‖KCl(a2)│Ag—AgCl(s) 的电动势与温度关系为 E/V=1.0367-5.42×10-4(T/K-298) 则反应 Zn+2AgCl(s)=2Ag+ZnCl2 在 293.2 K 时的焓变为:
【单选题】Because markets are often unpredictable, successful marketing is rather like hitting a moving target. Consumer tastes vary depending on fashions and trends, causing the demand for products to fluctuat...
A.
require no advertising
C.
match their capabilities
D.
exploit new technology
【单选题】Because markets are often unpredictable, successful marketing is rather like hitting a moving target. Consumer tastes vary depending on fashions and trends, causing the demand for products to fluctuat...
A.
require no advertising
C.
match their capabilities
D.
exploit new technology