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【单选题】
Given the following table definition: STOCK: item VARCHAR(30) status CHAR(1) quantity INT price DEC(7,2) If items are indicated to be out of stock by setting STATUS to NULL and QUANTITY and PRICE to zero, which of the following statements would be used to update the STOCK table to indicate that all the items whose description begins with the letter "S" are out of stock?（）A.
UPDATE stock SET (status = NULL; quantity, price = 0) WHERE item LIKE S%
B.
UPDATE stock SET (status, quantity, price) = (NULL, 0, 0) WHERE item LIKE S%
C.
UPDATE stock SET status = NULL, SET quantity = 0, SET price = 0 WHERE item LIKE 'S%'
D.
UPDATE stock SET (status = NULL), (quantity = 0), (price = 0) WHERE item LIKE S%
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【单选题】The head of the sperm contains______________.
A.
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B.
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C.
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D.
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A.
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B.
water jackets
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a fan
D.
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【单选题】Cylinder head contains ______ for cooling in the assembled engine.
A.
spark-plug holes
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valves pockets
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