2) John was born ____ . Even after repeated ____, he still walks with a tilt. Despite his physical ____, he successfully completed his college education and developed an interest ____. He writes fascinating stories and his works enrich the life of millions of young readers.(literature, surgery,limitation, cripple)
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3) John has recently found himself a job selling insurance. He works on straight ____. Most of the time,he is ____ but sometimes he sells door to door in some section of ____. He works so hard we are worried that it might be too great a strain on him. We tell him to slow the pace,but our advice ______ never registers with him. (territory, register,commission, on the phone)
11.09是四位有效数字,而pH=11.09是两位有效数字。
A. 对
B. 错
阅读《电力系统电压和无功电力技术导则DL/T 1773-2017》,35kV及以上用户供电电压正负偏差绝对值之和不超过额定电压的
A. 5%
B. 8%
C. 10%
D. 15%
半导体只读存储器(ROM)与半导体随机存取存储器(RAM)的主要区别在于()。
A. ROM可以永久保存信息,RAM在断电后信息会丢失
B. ROM在断电后信息会丢失,RAM则不会
C. ROM是内存储器,RAM是外存储器
D. RAM是内存储器,ROM是外存储器