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【单选题】
根据俯视图,选择正确的半剖主视图。。A.
a
B.
b
C.
c
D.
d
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反馈参考答案：
举一反三
【单选题】检样是指（ ）
A.
由分析对象大批物料的各个部分采集的少量物料。
B.
将许多份检样综合在一起的样品
C.
将原始样品按照规定方法经混合平均，均匀地分出一部分样品
D.
随机抽取的样品
【单选题】下面关于金属钠的描述正确的是 ( )
A.
钠的化学性质很活泼，在自然界里能以游离态存在
B.
钠离子和钠原子都具有较强的还原性
C.
钠能把钛 、 锆等金属从它们的盐溶液中还原出来
D.
钠和钾的合金可做原子反应堆的导热剂
【单选题】The shop assistant didn't give me the right______.
A.
change
B.
money
C.
serve
D.
note
【简答题】A．She isn't there in the morning. B．Her assistant isn't there in the morning. C．She won't have the forms he needs until the afternoon. D．She isn't as busy in the afternoon.
【简答题】A．She isn't as busy in the afternoon. B．She isn't there in the morning. C．Her assistant isn't there in the morning. D．She won't have the forms he needs until the afternoon.
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