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【简答题】
Digital cell phones offer more security, but the is that they have less power.
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皮皮学刷刷变学霸
举一反三
【单选题】已知 (Cu + /Cu) = 0.52 V , (Cu 2+ /Cu) = 0.34 V ,则 (Cu 2+ /Cu + ) 为 ( ) A. 0.16 V B. 0.18 V C. 0.86 V D. 0.70 V
A.
B.
C.
D.
D
【判断题】Once you establish your main points, you need to decide the order in which you will present them.
A.
正确
B.
错误
【单选题】Once you decide to ____what you believe is right, never give up halfway.
A.
pay off
B.
retreat from
C.
go after
D.
press for
【单选题】You have to decide the occupation you want to _______ once you graduate from college.
A.
pursue
B.
purchase
【单选题】—I’m thinking about withdraw (退出)from the committee. —Think it over. Once you decide, you won’t be ______ to the committee again.
A.
adopted
B.
admitted
C.
adapted.
D.
allowed
【多选题】下列叙述中正确的是
A.
已知反应：2Cu(IO 3 ) 2 +24KI+12H 2 SO 4 =2CuI↓+13I 2 +12K 2 SO 4 +12H 2 O，其中1mol氧化剂得到11mole -
B.
向NaClO溶液中通入少量SO 2 的离子方程式为：ClO - +SO 2 +H 2 O=Cl - +SO 4 2- +2H +
C.
已知反应：14CuSO 4 +5FeS 2 +12H 2 O=7Cu 2 S+5FeSO 4 +12H 2 SO 4 ，该反应中Cu 2 S既是氧化产物又是还原产物
D.
某反应体系中的物质有：N 2 O、FeSO 4 、Fe 2 (SO 4 ) 3 、HNO 3 、Fe(NO 3 ) 3 、H 2 O，若H 2 O是生成物，则N 2 O是还原产物
【单选题】298K 时,下列反应组装成原电池,测得电动势为零,则 c(Cu 2+ ) 应为 ______ mol/dm 3 。 Ni + Cu 2+ = Ni 2+ (1mol/dm 3 )+ Cu 已知 (Cu 2+ /Cu) = 0.3419V, (Ni 2+ /Ni) = -0.257V
A.
5.05×10 -27 mol/dm 3
B.
5.71×10 -21 mol/dm 3
C.
7.01×10 -14 mol/dm 3
D.
7.56×10 -11 mol/dm 3
【简答题】已知全集U=R,集合A={x丨2-丨x丨>-3},B={x丨丨2x-3丨<11},则A∩B=_______;Cu(A∩B)=_____.< /div>
【简答题】Once
you decide to ____ what you believe is right, never give up halfway.A. pay
off B. retreat
from C. go
after D. press
for
【简答题】Fill in the blanks with what you hear on the tape. Last minute Nanning travel planning can be a total nerve-wracking ___________.Start your Nanning holiday planning well _______________ will save you ...
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