在应急电源构形下,ACESSBUS:
A、在空速大于100节时自动卸载
B、在空速小于100节时自动卸载
C、在空速小于50节时自动卸载
D、在空速大于50节时自动卸载
参考答案:B
若|a|=3,|b|=7,且|a-b|=b-a,则a+b的值为______.
There is little food left in the ice box. We want some tomorrow. [ ]
A. buying
B. to buy
C. have bought
D. be bought