JZ-7型制动机自阀实行紧急制动时,机车自动撒砂是靠()完成的。
A、重联柱塞阀
B、放风阀
C、缓解柱塞阀
参考答案:A
下面是实验室常用的仪器
请回答下列的问题:
(1)可直接加热的有__________ (填序号)。
(2)仪器③和⑤的名称分别是__________。
(3)蒸发时除了用到③和⑧号仪器外,还要用到带有铁圈的铁架台和__________ (填仪器名称)。
(4)用仪器①能否量取8.68ml溶液__________ (填“能”或“否”)。
The suggestion that the mayor will present the prizes was accepted by everyone.
A.present
B.presents
C.would present
D.ought to present