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【单选题】
离心泵开动以前必须充满液体是为了防止发生
A.
气缚现象
B.
汽蚀现象
C.
气化现象
D.
冷凝现象
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举一反三
【单选题】冬虫夏草来源于()。
A.
多孔菌科真菌茯苓的干燥菌核
B.
棕榈科植物麒麟竭果实渗出的树脂经加工而成
C.
多孔菌科真菌猪苓的干燥菌核
D.
多孔菌科真菌灵芝(赤芝)或紫芝的干燥子实体
E.
麦角菌科真菌冬虫夏草寄生在蝙蝠蛾科昆虫幼虫上的子座及幼虫尸体的复合体
【判断题】茯苓来源于多孔菌科真菌茯苓的干燥菌核。 A. 对 B. 错
A.
正确
B.
错误
【判断题】茯苓来源于多孔菌科真菌茯苓的干燥菌核。
A.
正确
B.
错误
【单选题】Practically speaking, the artistic maturing of the cinema was the single-handed achievement of David W. Griffith (1875-1948). Before Griffith, photography in dramatic films consisted of little more th...
A.
are like films
B.
may not narrate events chronologically
C.
exploit cinema' s language
D.
feature juxtaposed images
【简答题】阅读理解。 Bruno was a boy of eight. His father worked in a cinema and his mother worked in a shop. He lived not far from his school. He always walked there and walked home. On his way to school, he had to...
【判断题】茯苓来源于多孔菌科真菌茯苓的干燥菌核。()
A.
正确
B.
错误
【单选题】安装钢筋时,绑扎箍筋、横向钢筋间距的允许偏差为()mm以内。
A.
± 5
B.
± 10
C.
± 15
D.
± 20
【单选题】钢筋绑扎时,箍筋间距的允许偏差为( )。
A.
±10mm
B.
±15mm
C.
±20mm
D.
±25mm
【单选题】绑扎独立柱时,箍筋间距允许偏差为±20mm,其检验方法是( )。
A.
钢尺量连续三档,取最大值
B.
钢尺量连续三档,取平均值
C.
钢尺量连续三档,取最小值
D.
钢尺连续量十档,取平均值
【单选题】Since the cinema was ___ , I had to go home to watch TV.
A.
packed
B.
crowded
C.
filled with
D.
full of
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