为保证不易发生异变,麦冬的含水量应控制在()
A.12%~17%
B.11%~16%
C.11%~15%
D.6%~9%
E.4.5%~6%
参考答案:C
No matter how frequently__,the works of Beethoven still attract people all over the world.
A.performed
B.performing
C.to be performed
D.being performed
在航空发展初期,影响航空安全的主要因素是()
A、生产力发展水平低
B、科学技术相对落后
C、人为因素理论研究欠缺
D、飞机设计及制造方面存在的缺陷较为突出