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【单选题】
某数控机床运行一个月后,发生Z轴方向加工尺寸不稳定,尺寸超差无规律,CRT及伺服放大器无任何报警,则可判断是由A.
（ ）原因造成的。
B.
主轴跳动误差大
C.
Z 轴联轴器联接螺钉松动
D.
加工原点设置错误
E.
编程时Z轴赋值错误
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反馈参考答案：
举一反三
【单选题】Under the allowance method of recognizing uncollectible accounts, the entry to recognize the collection of a previously written off uncollectible account
A.
increases net income.
B.
has no effect on the allowance for doubtful accounts.
C.
decreases the allowance for doubtful accounts.
D.
increases the allowance for doubtful accounts.
【单选题】敦煌曲子词中有这样的诗句:“满眼风波多闪烁,看山恰似走来迎,仔细看山山不动,是船行。”其中“看山恰似走来迎”和“是船行”所选的参考系分别是( ) A .船和山 B .山和船 C .地面和山 D .河岸和流水
A.
？
B.
？？
C.
？？？
D.
？？？？
【简答题】从计算机的角度看，信息系统只是一个“计算过程”，___应该是构成信息系统的部分要素。 A)测量 B)用户 C)处理 D)通信
【单选题】Under the allowance method of recognizing uncollectible accounts, the entry to write off an uncollectible account
A.
increases the allowance for doubtful accounts.
B.
has no effect on the allowance for doubtful accounts.
C.
has no effect on net income.
D.
decreases net income.
【单选题】Under the equity method of accounting for a stock investment, cash dividends received are considered a reduction of the investee's net assets.
A.
TRUE
B.
FALSE
【简答题】单晶硅太阳能电池的优点。
【单选题】The entry to write off an account receivable under the allowance method will:
A.
reduce net income.
B.
have no effect on net income.
C.
increase total assets.
D.
increase net income.
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