当电动执行机构的不灵敏区太小时,执行机构将出现()。
A.实际定位与信号不符
B.反转
C.振荡
D.停止
参考答案:C
北京市申办2008年奥运会,得到全国人民的热烈支持,据统计,某一日北京申奥网站访问人数约为352 000,用科学记数法表示为 _________ .
—The Kiwi fruits in this supermarket are _______ sale now, and they are sold ______ the pound.
— Really? How much cheaper are they?
A.for; in
B.on; by
C.for, by
D.on, in