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业余无线电爱好者无意接收到非业余业务和卫星业余业务的信息时，应遵守的规则为？
On commonly used ships,if two A√Cgenerators are operated in parallel, the load is distributed evenly by （）.
A. varying the D-Cexciter voltage
B. varying the reluctance of the air gap
C. regulating the speed of prime mover
D. shorting out part of the armature winding
对于卷筒直径3m以下矿井提升设备的预防性计划检修大修周期规定为（）个月。
A. 72
B. 48
C. 36
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