题目内容

已知向量组a1=(1,2,3), a2=(2,2,k)正交，则数k=

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设A为3阶矩阵，将A的第1行与第2行交换得到矩阵B，则∣A-B∣=

Task 4
Directions: The following is a list of road signs. After reading it, you are required to find the items equivalent to (与……等同) those given in Chinese in the table below. Then you should put the corresponding letters in the brackets on the Answer Sheet, numbered 6 through 10.
A--No parking in front of this gate
B--Guest&39;s ear park
C--Dangerous bend
D--Diverted traffic
E--Limited parking
F--Low bridge ahead
G--New hours of parking control
H--Entry to motorway
I--Parking for taxis only
J--No entry
K--Pedestrian crossing ahead
L--Peak hours only
M--Please drive carefully
N--Road closed
O--Speed limit of 48 kmh
P--In case of fire, stay in vehicle
Q--One way
6. ()弯道危险 ()访客停车场
7. ()此路封闭 ()只准许出租车停
8. ()前方桥低 ()只限高峰时段
9. ()禁止驶入 ()限速每小时48公里
10. ()单行道 ()停车位有限

通用桥式和门式起重机空载时，小车车轮踏面的与轨道之间的最大间隙，手动的最大不应大于小车基距或小车轨距的()倍。

A. 0.002
B. 0.0025
C. 0.003
D. 0.0035

现场组装通用桥式起重机的小车运行机构时，小车轨距和轨距的()，应符合设备技术文件的规定。

A. 相对差
B. 同位差
C. 位移度
D. 高低差