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【单选题】
Task 2 Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45. Holiday Homes in Mallorca Holiday apartments in Mallorca sailing and fishing port—quiet even in summer season. Beautiful rooms with views of the sea and mountains, yet near shops and restaurants. Cars and bicycles are for hire. Sailing and sports clubs nearby. Holidays in Comfort Luxury(豪华) coach tours in Italy, out of normal holiday season. 21 leisurely days to visit five Italian cities starting from London on 1st September. The tours are guided by Professor Martin Davis, formerly Head of Italian Studies, London University. See the arts and culture of Italy on history. Kibbutz(集体农场) Holidays in Israel Working holidays on a kibbutz in Israel. All countries welcome for one to three months if prepared to work morning with kibbutz members. Hotels, food and trips to sights on history all provided FREE—you pay only for the special low-cost return flight. If we have a holiday for sailing and fishing, we should go to ______.
A.
Kibbutz
B.
Italy
C.
Mallorca
D.
Israel
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【判断题】反抗转矩的方向恒与运动方向相反,运动方向发生改变时,反抗转矩的方向也会随之改变,因而它总是阻碍运动的。
A.
正确
B.
错误
【单选题】一平面简谐波表达式为y =-0.05sinπ(t-2x)(SI),则该波的频率υ(Hz)波速u(m/s)及波线上各点振动的振幅A(m)依次为
A.
1/2   1/2   -0.05
B.
1/2   1   -0.05
C.
1/2   1/2   0.05
D.
2   2   0.05
【单选题】一平面简谐波表达式为y=-0.05sinp(t-2x)cm, 则该波的频率为 Hz。
A.
0.5
B.
1
C.
2
D.
2.5
【单选题】一平面简谐横波的波动表达式为y=0.05Cos(20πt+47πχ)(SI)。取k=0,±l,±2,…,则t=0.5s时各波峰所在处的位置为( )。
A.
正应力增大,轴向变形增大
B.
正应力减小,轴向变形减小
C.
正应力不变,轴向变形增大
D.
正应力减小,轴向变形不变
【判断题】反抗转矩的方向恒与运动方向相反,运动方向发生改变时,负责转矩的方向也会随之改变,因而它总是阻碍运动的
A.
正确
B.
错误
【单选题】中国药典一部收载的水份测定法有几种方法
A.
1
B.
2
C.
3
D.
4
E.
5
【单选题】一平面简谐横波的波动表达式为y=0.05cos(20πt+4πx)(SI)。取k=0,±1,+2,…,则t=0.5s时各波峰所在处的位置为( )。
A.
B.
C.
D.
【判断题】反抗转矩总是阻碍运动,运动方向发生改变时,负载转矩的方向也会随着改变。
A.
正确
B.
错误
【单选题】一平面简谐波表达式为y=-0.05sinπ(t-2x)(SI),则该波的频率v(Hz),波速u(m/s)及波线上各点振动的振幅A(m)依次为()。
A.
1/2,1/2,-0.05
B.
1/2,1,-0.05
C.
1/2,1/2,0.05
D.
2,2,0.05
【单选题】一平面简谐波表达式为y=-0.05sinπ(t-2x)(SI),则该波的频率γ(Hz)、波速u(m/s)及波线上各点振动的振幅A(m)依次为:()
A.
, ,-0.05
B.
,1,-0.05
C.
, ,0.05
D.
2,2,0.05
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