Do you know where some maps? [ ]
A. can I buy
B. can buy
C. I can buy
D. buy
答案:C
临床常见的寒热类型有________、________、________、________。
一个采(盘)区内同一煤层双翼开采或者多煤层开采的,该采(盘)区最多只能布置2个采煤工作面和4个煤(半煤岩)巷掘进工作面同时作业。