若直线y=0的倾斜角为α,则α的值是( ) A.0 B.π4 C.π2 D.不存在

题型:选择题

问题:

若直线y=0的倾斜角为α,则α的值是(  )
A.0B.
π
4
C.
π
2
D.不存在
考点:直线的倾斜角与斜率
题型:选择题

During our two months on the road, Bennett and I had a really (1) experience with a good, honest (2) and some helpful mechanics.

We were driving east on Highway 10 when our "chick engine" light came on. We limped of a(n) (3) into Las Cruces. We had a real car (4) Bennett nursed the ear into a local garage. By this time the car was missing so (5) it was shaking all over. This was the (6) time to arrive at a garage—late Friday afternoon. Service adviser Scott was busy (7) paper work and customers as we (8) our problems. (9) he was already "ten cars behind", he told us to pull the car into the garage.

Lincoln, who we later (10) was one of the two motor technicians, took (11) of our car repairing. He and Scott and some other mechanics stayed several hours after closing, (12) the car.

Early the next morning (the shop was officially closed on Saturdays), Lincoln finally located the (13) and fixed it easily within only (14)

Later Scott (15) out to us that it was our attitude that helped. "You didn’t come into the place demanding this or that. You showed an (16) of our problems on a busy Friday afternoon. Customer’s attitude means a lot. " He was right in some way, customers should show (17) and understanding to people who (18) them. (19) people were extremely busy, they found way to at least try and help when they are met with politeness.

The pleasant experience I had shows that (20) for other people can always help.

3().

A.exit 

B.turning 

C.crossing 

D.entrance

题型:选择题

减小与抑制散射线的办法中,错误的是

A.减小被照体体积

B.加大被照体—胶片距离

C.增加附加滤过

D.扩大照射野

E.安装多层遮线器

题型:选择题

伤寒复发的原因是()

A.再次感染伤寒杆菌

B.菌血症未完全清除

C.胆囊及肠道的伤寒杆菌侵入血流

D.潜伏在病灶或巨噬细胞内的伤寒杆菌再度繁殖入血

E.以上都不是

题型:选择题

电潜泵供电流程为()。

A.地面电网-控制器-变压器-接线盒-电缆-电机

B.地面电网-接线盒-变压器-控制器-电缆-电机

C.地面电网-变压器-控制器-接线盒-电缆-电机

D.控制器-接线盒-地面电网—变压器-电缆-电机

题型:选择题

如图,分隔前组筛窦与后组筛窦的解剖标志是()

 

A.中鼻甲基板

B.中鼻甲附着处

C.筛前动脉

D.筛后动脉

E.上颌动脉

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