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【单选题】
( )能够节省钢材和造价,管壁光滑不易结垢,但重量大,不便于运输和安装。A.
预应力钢筋混凝土管
B.
自应力钢筋混凝土管
C.
钢管
D.
玻璃钢管
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皮皮学刷刷变学霸
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【简答题】主要的胃肠激素有 、 、 、 四种。
【简答题】完形填空 A soldier returned to his castle at dawn.He was in a mess.His clothes were 1 ; his face was bloody; his horse was lame.His 2 met him at the gate,asking,'What has happened to you?' 3 himself up as...
【单选题】The young man s clothes were scattered about his room______.
A.
at will
B.
at random
C.
with a hurry
D.
at time
【单选题】His clothes were _______ to the occasion.
A.
potential
B.
average
C.
considerable
D.
appropriate
【简答题】The Pathfinder When we found him, he was a sorry sight. His clothes were torn, his hands bleeding. Before we reached him, we saw him fall. He lay a moment. Then he pulled himself to his feet, walked u...
【简答题】胃肠激素的作用主要有______、______和______。
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