飞机在平飞时.载重量越大其失速速度().
A、越大
B、角愈大
C、与重量无关
D、对应的失速迎角
参考答案:A
She often thinks that he will succeed if he works hard, _____?[ ]
A. doesn't she
B. won't he
C. isn't she
D. doesn't he
对小儿喉痉挛的描述,错误的是()。
A.多见于2~3岁的婴幼儿
B.多发生于营养不良、体弱或佝偻病的儿童
C.常在夜间突然发生
D.发作时有吸气性呼吸困难、喉喘鸣及声音嘶哑
E.发作时间短暂,可反复发作并可连续发作