小儿心肺复苏时胸外按压速率是 A: 100~120<br/>次/分 B: 100~110<br/>次/分 C: 80~120<br/>次/分 D: 100~150<br/>次/分 E: 110~120<br/>次/分

In structure, business letters usually contain 11 basic components. They are the heading, , the inside address, the subject heading, , , the body of the letter, , , the signature and .

What are the six parts of a business letter? ( ) A: The heading, the subject, the salutation, the body, the<br/>complimentary close and the signature. B: The heading, the addressee, the salutation, the body, the<br/>complimentary close and the signature. C: The heading, the inside address, the salutation, the body, the<br/>complimentary close and the typed name. D: The heading, the inside address, the salutation, the body, the<br/>complimentary close and the signature.

Unit Check 11 短听力选择 -3 听一遍，选择正确答案 What problem did the crew report A: One passenger is suspected to have a heart attack B: One passenger is struck by lightning C: One of the crewmembers got incapacitated D: One passenger has been severely injured

无限循环小数\(0.777\cdots\)化为分数为( ). A: \(<br/>{7 \over {11}} \) B: \(<br/>{7 \over {10}} \) C: \(<br/>{7 \over 9} \) D: \(<br/>{7 \over 8} \)