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【单选题】
有关系固设备的使用注意事项，下述描述正确的是：①所有系固设备必须具有由主管机关签发的合格证书；②配套使用系固设备时，应以系固系统中最小的MSL作为整个系固系统的MSL；③对重复使用的钢丝绳，其MSL可取破断强度的30%；④补充或更新手柄式扭锁时，新上扭锁与现有扭锁的锁绞方向一致A.
①~④
B.
除④
C.
除③
D.
除①
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知识点：
皮皮学刷刷变学霸
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【简答题】简述订单驱动与报价驱动两种场内交易系统的特点。
【简答题】简述订单驱动与报价驱动两种场内交易系统的特点。
【单选题】Madonna buys only two goods. Her utility function is Cobb-Douglas. Her demand functions have which of the following properties?
A.
Her demand for one of the two goods does not depend on income.
B.
Her demand for neither good depends on income.
C.
Her demand for each of the two goods depends only on her income and on the price of that good itself.
D.
Her demand for each of the goods depends on income and on the prices of both goods.