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【单选题】
普通型携带式电气测量仪表必须在瓦斯浓度（）以下地点使用。A.
0.5％
B.
1.0％
C.
1.5％
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】妊娠晚期,正常胎位,羊水中不应含有
【单选题】Consider A/a and B/b are two pair of independently assorting genes. When AaBb selfcross, the phenotype of the offspring is 9(A_B_) : 3(A_bb): 4(aaB_+aabb). There are six states about this inheritance....
A.
① and ③
B.
① and ⑤
C.
② and ④
D.
② and ⑥
【单选题】____ and ____ refer to adjustments associated with the quantity of product.
A.
allocating; assorting
B.
accumulating; allocating
C.
sorting out; accumulating
D.
sorting out; assorting
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