目前加油车油泵主要有多极自吸式离心泵和（）两种。
A、多级单吸式离心泵B
暂无解析
I'msorryI'veforgottentopostyourletter.
—Nevermind._____postitmyself.
Hiswholeschooleducation________only2yearsbecauseofhisillness.
--Mike,you’vegotsomanybeautifulstamps.
--Yeah.I_________collectstampswhenIwasinprimaryschool.
下列因素中，属于国际直接投资的内容主要有______
Weneedfriendsto________,orwewillfeellonely.
