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问题
判断题
熔融指数大的树脂适合于加工注射成型小型、厚壁零件。
答案
参考答案:错
补全对话,情景问答
读问句,选出合适的答语。
( ) 1. What's this?
( ) 2. Where is north?
( ) 3. What country is west of China?
( ) 4. What do they speak in Mexico?
( ) 5. What colour is it?
A. North is up.
B. It's the U. K.
C. English.
D. It's a tree.
E. It's black.
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单项选择题
以下哪一项因素与左心房内径增大无直接关系
A.肺静脉回流血量增多
B.二尖瓣反流
C.二尖瓣狭窄
D.肺动脉瓣狭窄
E.缩窄性心包炎
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