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【单选题】
晶闸管的条件是( )。A.
加反向电压
B.
阳极加反向电压或降低正向阳极电压使流过晶闸管的电流小于维持电流
C.
去掉门极控制电压
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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...
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