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【单选题】
已知某轴的公称尺寸为φ30mm,最大极限尺寸为φ30.033 mm,最小极限尺寸为φ30.011mm,则该轴的上极限偏差为( )mm。A.
+0.033
B.
+0.011
C.
+0.022
D.
+0.044
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举一反三
【单选题】Internet marketing, also _______ online marketing or e-marketing, is referred to as the marketing of products or services over the Internet.
A.
known as
B.
is known as
【简答题】Internet marketing
【简答题】3) What is d igital marketing often referred to as “ online marketing ” , “ internet marketing ” or “ web marketing ” .
【单选题】In marketing, the use of the Internet can help businesses to ______.
A.
identify their competitors
B.
improve their products
C.
provide comprehensive service
D.
change their mindset
【多选题】在以下四个选项中关于乳化液泵安全阀说法正确的是()
A.
安全阀是泵的过载保护元件
B.
安全阀的调定工作压力为泵站工作压力的110%-115%
C.
安全阀主要由两套并联的单向阀、主阀和一个先导阀组成
D.
调整弹簧的作用力即能改变安全阀的开启压力
【多选题】Internet marketing presents marketing practitioners with special challenges including _______
A.
Customer empowermen t
B.
Real-time interactivitie s
C.
High level of market transparency
D.
Difficulty maintaining competitive advantag e
【判断题】In global Internet marketing, marketers can take other countries and their populations for granted without restraint.()
A.
正确
B.
错误
【判断题】在切削加工中,进给运动只能有一个。( ) 2、 退火和正火一般作为预备热处理,通常安排在毛坯制造之后,粗加工之前进行。( ) 3、 工序集中优于工序分散。( ) 4、过定位是允许的,( )欠定位是允许的。( )
A.
正确
B.
错误
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