氢质子在1特斯拉的静磁场中的共振频率为（）
A.64MHz
B.0.36MHz
C.1MHz
D.42.58MHz
E.100MHz
参考答案：D
转炉煤气的主要可燃成分是（）。
Settlers streamed into Connecticut River towns in so large numbers between 1765 and 1790 that they nearly doubled the population of Hampshire County, Massachusetts.
