当系统中发生事故时,变压器允许过负荷运行。()
参考答案:对
The two brothers carried a ______ bed into the room.
A.double
B.deal
C.slight
D.opposite
肺V20<25%时肺癌靶区剂量可给予()。
A.60Gy
B.70Gy
C.80Gy
D.90Gy
E.100Gy