题目：
How should you signal the crane operator to raise the boom and lower the load?（）.
A.Extend arm with the palm down and and hold this position rigidly
B.Place both fists in front of the body with the thumbs pointing outward each other
C.Clasp hands in front of you body
D.Extend arm with the thumb pointing up, and flex the finger s in and out for as long as the load movement is desired
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对解析： 计划成本计价核算的企业，发出材料应负担的成本差异，应按月计算分配，不得按季或按年分摊。
