有字符串变量$str="欢迎Smith教授";下面哪个函数可以正确计算出该字符串的长度为9？

Clerk: Good morning. Can I help you Mr. Smith: Yes, I"d like a ticket to New York 9:15 tomorrow morning. Clerk:______ Mr. Smith: Single, please. A: Single or two B: Single or return C: Single or double D: Single or back

When we meet a man called “John Smith” for the first time, it’s better to call him ___________. A: Smith B: Mr. Smith C: John D: John Smith

I stayed at ________ yesterday, for he was badly ill. A: the Smith's B: the Smith C: the Smiths D: Smith home

A: Mr. Smith would like to reschedule Friday's appointment to next Wednesday at 9 O'clock. B: ______. A: This Friday would be fine. B: Sorry, I'm busy on Wednesday at 6 p. m.. C: Sure, no problem. D: I would like to talk to Mr. Smith right now.

用PubMed检索Smith J在《Cell》上发表的文献的检索式是 ( ) A: Smith J[TA] AND Cell[AU] B: Smith J[TI] OR Cell[AU] C: Smith J[AU] OR Cell[TA] D: Smith J[AU] AND Cell[TA] E: Smith J[AU] AND Cell[TI]

Smith

Smith

The party was organised by the Smith family. = It was the ___ party.Smith's A: Smith's B: Smiths'

Mrs. Smith has no idea what to buy for Mr. Smith’s birthday.