题目内容

The following information is available for company X:20X7 20X8Profit7,500 9,000Sales50,000 450,000Capital employed37,500 60,000Calculate the change in ROI from 20X7 to 20X8.

A. Decrease from 20% to 15%
B. Increase from 1.5% to 2%
C. Increase from 7.5% to 13.3%
Decrease from 100% to 90%

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The following statements are about return on investment and residual income.(i) Return on investment is a relative measure(ii) Residual income is an absolute measure(iii) Return on investment and residual income are absolute measures(iv) Both return on investment and residual income involve a cost of capital figure, which is difficult to calculate Which statement/statements are true?

A. (iii) only
B.(iv) only
C. (i), (ii) and (iv) only
D.(iii) and (iv) only

单位质量的物质所吸收到的辐射能量称为

A. 照射量
B. 吸收剂量
C. 当量剂量
D. 电荷量

能更好地与射线所致有害效应的严重程度相联系的剂量是

A. 照射量
B. 吸收剂量
C. 当量剂量
D. 电荷量

在进行外照射防护时，下列说法正确的是

A. 各种射线均可以用手套屏蔽
B. α射线外照射用手套即可屏蔽
C. β射线外照射用手套即可屏蔽
D. γ射线外照射用手套即可屏蔽