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【多选题】
下列哪些为腰背痛的常见原因?A.
急慢性外伤
B.
感染
C.
肿瘤
D.
内脏系统疾病
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反馈参考答案：
举一反三
【简答题】简述同步发电机的工作原理
【简答题】En este insituto se puede estudiar español, inglés y __________.
【单选题】Refer to Exhibit 12-3. Graph A exhibits a price-taking firm:
A.
experiencing an economic loss of $80.
B.
making an economic profit of $80.
C.
making an economic profit of $400.
D.
experiencing an economic loss of $400.
【简答题】试述同步牵引发电机工作原理。
【多选题】异步发电机工作原理说法正确的是
A.
当转子的转速小于同步转速时，电机从电网吸收有功功率将电能转化为机械能
B.
当转子的转速小于同步转速时，电机将机械能转化为电能并向电网输出有功功率
C.
当转子的转速大于同步转速时，电机将机械能转化为电能并向电网输出有功功率
D.
当转子的转速大于同步转速时，电机从电网吸收有功功率将电能转化为机械能
【单选题】Refer to Exhibit 12-3. Total revenue for the firm in Graph C equals:
A.
$120.
B.
$150.
C.
$600.
D.
$720.
【单选题】Refer to Exhibit 12-2. When the market price equals $54, the firm:
A.
ould continue operating temporarily despite an economic loss because the firm is able to cover a portion of its fixed costs.
B.
should shut down.
C.
should continue operating temporarily despite an economic loss because the firm is able to cover all of its variable costs.
D.
should continue operating temporarily despite an economic loss because the firm is able to cover a portion of its fixed costs.
E.
should continue operating because the firm is making a profit.
【简答题】抢篮板球技术是由抢占位置、_____、_____和球后动作四个环节组成。
【单选题】Refer to Exhibit 12-6. The short run ____ for this firm is represented by the area of ____.
A.
profit; OP1Bq
B.
loss; OP1Bq
C.
profit; PABP1
D.
loss; PABP1
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