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【多选题】
对城市燃气管网布置的一般原则表述正确的选项包括（）A.
应结合城市总体规划和有关专业规划进行
B.
管网规划应贯彻远近结合，以远期为主的方针，应提出分期建设的安排，以便于设计阶段开展工作
C.
应增加穿、跨越河流、水域、铁路等工程，可以缩短铺设距离
D.
为确保供气可靠，一般各级管网应沿路布置
E.
应尽量靠近用户，以保证用最短的线路长度，达到同样的供气效果
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举一反三
【单选题】Captain Smith didn't inform. his officers of the tree situation because he didn't want to cause a panic.
A.
Y
B.
N
C.
NG
【单选题】— Are you satisfied with what the captain explained? — Not at all. It couldn't have been _____. [ ]
A.
so bad
B.
the worst
C.
the best
D.
worse
【简答题】______ the determined captain , all the passengers on board wouldn ' t have been saved. [ A]It had not been for [ B ] Had it not been for [ C]lf it had not for [ D] Not had been for
【单选题】At first the captain didn't worry because the ship was said to be _______.
A.
unsinkable
B.
perfect
C.
unprepared
D.
unusually
【简答题】请简要描述马可波罗个人及其游记。
【单选题】______ the determined captain, all the passengers on board wouldn't have been saved.
A.
It had not been for
B.
Had it not been for
C.
If it had not for
D.
Not had been for
【单选题】共析转变和共晶转变的根本区别是________。
A.
共析转变前的母相是液相,而共晶转变前的母相是固相
B.
共析转变前的母相是固相,而共晶转变前的母相是液相
C.
共晶转变后的产物是固相,而共析转变后的产物是液相
D.
共析转变后的产物是固相,而共晶转变后的产物是液相
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