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【单选题】
A production process has been defined as part of an industrial equipment manufacturing project. The process is intended to produce steel bolts with a length of 20cm. The control limits are 19.955cm and 20.045cm. The measurements made at the end of the process yielded the following results: 20.033cm, 19.982cm, 19.995cm, 20.006cm, 19.970cm, 19.968cm, 19.963cm, 19.958cm, 19.962cm, 19.979cm, 19.959cm. What should be done ？（）A.
The process is tinder contr01. It should not be adjusted.
B.
A special cause should be investigated, the process should be adjusted.
C.
The control limits should be adjusted.
D.
The measuring equipment should be recalibrated.
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举一反三
【单选题】若关于 y 的一元二次方程 ky 2 - 4 y - 3=3 y +4 有实根 , 则 k 的取值范围是 ( )
A.
k > － ( 7/4 )
B.
k ≥ — ( 7/4 ) 且 k ≠0
C.
k ≥ －（7/4）
D.
k > 7/4 且 k ≠0
【单选题】IM 营销的优点包括( )。
A.
成本低廉，反馈及时，针对性强，互动性强
B.
平台好、受众广、精确性高、成本低、回报快
C.
门槛低、平台好、受众广、灵活性大、成本低
D.
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