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问题 单项选择题

根据BIM建议，当求总不确定度时，需将合成不确定的乘一个因子，此因子是（）。

A.2

B.2.5

C.3

D.未作具体规定

答案

参考答案：D

阅读理解
阅读下面短文，从各题所给的四个选项(A、B、C和D)中，选出最佳选项。
     If you are cycling in foreign countries, you will need to know what these traffic signs and signals mean.
 
1.      A sign like this one means that there is a bike lane (车道). If there is such a
sign, you are required to use the bike lane. If there is not such a sign, you
should ride with traffic as far to the right side of the road as possible.
2.     This signal means you can cross the street along with pedestrians (行人).
It has a green picture of a person walking instead of using the word "walk".
3.      This signal is the "don't walk" sign. It is a picture of a red hand, meaning
you should stop. You should wait to cross the street until the green picture
of the person walking is showing.
4.      Car drivers and bikers must come to a complete stop at "STOP" signs.
5.      A "YIELD" sign means to slow down and be ready to stop. If there are
pedestrians or vehicles in or near the crossroad, you must stop. If there is
no traffic in or near the crossroad and it is safe, you may go through.
6.     This signal means you are coming to a zebra crossing. Car drivers and
bikers must stop to allow people in the zebra crossing to cross the street.
7.      When people are working on the roads, parts of the road are often dug up
or rough (不平整的). Be careful when you are cycling. Rough roads could
make you fall off your bike. If you must move into the road to go around a
work area, you should stop and look carefully to be sure there is no traffic
coming.
8.      A detour is a way of getting around a roadway that is closed. Roads are
usually closed because of road work or dangerous conditions. If you must
take a detour, be careful about the roads you aren't used to.
1. What are cyclists required to do when they see the sign ?
A. To ride against traffic.
B. To ride on the left side of the road.
C. To ride on the bike lane.
D. To ride on the right side of the road.
2. Which of the following signs has the same meaning as the sign?
A. B.C.D.
3. What should cyclists do when they see the sign?
A. They should be careful when they cycle on the rough road.
B. They should take the rough road and fall off their bikes.
C. They should move into the road to go around a work area.
D. They should take another route instead of the closed roadway.
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选择题

—May I go outside and play for a while, Mum?    

—No, ___ your homework is done.          [ ]

A. as                          

B. before          

C. not until                    

D. the moment
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