同一转向架空簧压力差为不大于()。
参考答案:20kPa
If I can help_______, I don't like working late into the night.
A.so
B.that
C.it
D.them
临床为减少高分化肝细胞癌18F-FDGPET显像的假阴性,拟进一步选用的正电子核素显像剂是()。
A.11C-乙酸盐
B.11C-choline
C.11C-MET
D.18F-MISO
E.18F-FLT