[单选题]警车、消防车、救护车、工程救险车标志图案的喷涂以及警报器、标志灯具的安装、使用规定，由（ ）制定。
A.A、公安机关交通管理部门
B. B、国务院公安部门
C. C、交通管理部门
D.D、公安机关管理部门

[多选题]黄某趁手机店售货员接待其他顾客时，伸手从柜台内拿出一个价值2400元的手机握在手里并用围巾遮挡，然后继续在柜台边假装观看。过了一会，售货员发现少了一部手机并怀疑黄某，便立即报告店长和保安人员。黄某见状，速将手机放回柜台内后逃离。关于本案，下列说法正确的是（ ）。
A.陈某的盗窃行为属于未遂
B.陈某的盗窃行为已经既遂
C.陈某将手机扔回柜台内属于中止行为
D.陈某将手机扔回柜台内属于犯罪既遂后返还财物的行为

[判断题]防喷器换装采油(气)树操作规程要求对油管堵塞阀进行反试压至额定工作压力的80%(28MPa),稳压15min合格。
A.正确
B.错误

[判断题]主切削平面垂直于主刀刃。

[判断题]可以在桥梁、站台、路肩上使用自行车等交通工具。
A.正确
B.错误

[单项选择]Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries. Yet much had happened (31) . As was discussed before, it was not (32) the 19th century that the newspaper became the dominant pre-electronic (33) , following in the wake of the pamphlet and the book and in the (34) of the periodical. It was during the same time that the communications revolution (35) up, beginning with transport, the railway, and leading (36) through the telegraph, the telephone, radio, and motion pictures (37) the 20th-century world of the motor car and the airplane. Not everyone sees that process in (38) . It is important to do so.
It is generally recognized, (39) , that the introduction of the computer in the early 20th century, (40) by the invention of the integrated circuit during the 1960s, radically changed the process, (41) A. on
B. out
C. over
D. off