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【单选题】
下列哪种寄生虫可自体感染?A.
似蚓蛔线虫
B.
蠕形住肠线虫
C.
十二指肠钩虫
D.
鞭形线虫
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反馈参考答案：
举一反三
【简答题】请分别画出单相电子式电能表接线图、三相四线电能表接线图、三相三线电子式电能表接线图。
【单选题】听对话，回答问题。 What did the boy do last weekend? [ ]
A.
Did his homework and helped his father sell clothes.
B.
Went to a piano lesson and played soccer.
C.
Helped his sister study English and did his homework. v
【单选题】This poor boy was treated so ___ by his stepmother that we all helped him.
A.
good
B.
well
C.
bad
D.
badly
【单选题】Lucy , a _______ girl , helped the little boy find his parents. [ ]
A.
twelve year old
B.
twelve years old
C.
twelve-year-old
D.
twelve-years-old
【简答题】The boy helped his grandpa _____(扫) the floor.
【简答题】立式圆筒形钢油罐分类多以罐顶结构命名,其中目前最常见的是 、 和 。
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