如果发动机的油门为风控式,当无风或者风压不足时,会造成启动困难或无法启动,此时需拉动机外()。
参考答案:手控油门
These are the photos of our village, and they will show you ________.
A.what does it look like
B.what it looks like
C.how does it look like
D.how it looks like
严重缺乏时主要表现为巨幼红细胞性贫血的是()
A.维生素B1
B.维生素B2
C.维生素B12
D.维生素C
E.维生素D