安全阀按其整体结构及加载机构的不同可以分为重锤杠杆式、弹簧式和脉冲式三种。
参考答案:对
课文填空(共9小题;每小题1分,满分9分)
_____小题1:______ a calculating machine, I could__小题2:______ difficult sums. I developed slowly for hundreds of years until I was made to work as a “universal machine”. From then on, I grew ____小题3:______ both in___小题4:______ and in brainpower .Then as my memory improved, I changed my ____小题5:_______ to a much smaller one. But I have to stand there by myself, feeling so ______小题6:_____ . Since the 1970s, many new applications _____小题7:______ (find) for me and I have become very important in communication, finance and trade. To provide humans with a life of high___小题8:_____ is what I am all about. I am really proud that I am a_____小题9:_____ friend and helper of the human race.
伊斯兰教最基本的经典是
A.《古兰经》
B.《圣经》
C.《大乘经》
D.《小乘经》