Excuse me,I'm new here. Could you tell me _____? [ ]

A. where is the book store

B. that if there was a bookstore

C. where the bookstore is

D. how long does it take to get to the bookstore

GK1C机车输入信号X42是表示柴油机（）。

A、加载保护

B、起动保护

C、运转保护