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【多选题】
多选题: 插装阀有哪些优点?A.
能力大，特别适用于大流量场合；
B.
阀芯动作灵敏，抗堵塞能力强；
C.
密封性好，泄漏小，油液流经阀口压力损失小；
D.
结构简单，易于实现标准化；
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皮皮学刷刷变学霸
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【单选题】闻名世界的 河发源于英格兰南部,注入北海。是英国的母亲河,贯穿伦敦与沿河的10多座城市,流经之处都是英国文化的精华所在,
A.
易北
B.
泰晤士
C.
塞纳
D.
莱茵
【简答题】Listen to the passage and fill in the blanks with the words you hear. Scientists ______1______ animals for many years. In 1952, the first animal, a tadpole, was cloned. Before the _______2______ of Do...
【简答题】Dolly was the first ____________ (clone) animal in the world, born on July 5, 1996.
【单选题】________ is the first cloned mammal in the world, who was cloned in 1996.
A.
Noto and Kaga (the first cows cloned in 1998 in Japan)
B.
Dolly
C.
Cumulina (the first mouse cloned in 2000)
D.
Mira (the first goat cloned in 1998 in the USA)
【简答题】Listen to the passage about animal cloning and fill in the blanks . tadpole: 蝌蚪 somatic: 身体的,体壁的 embryonic: 胚胎的 strip: 剥去 gaur: 野牛 traumatic: 创伤的 Scientists have been cloning animals for many years. I...
【简答题】 1. Although one reason is the inconsistent application of punishment, another may be the fact that imprisonment no longer carries the intense stigma it once had, so that prison is no longer as an ef...
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