?Identify the rule centers an h1 element.
A. h1 {text-align: center;}
B. ? text-align: center;
C. {align: center;}
D. h1 {align: center;}
Answer: A
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Using the Hotel schema given at the start of the Exercises at the end of Chapter 4, determine whether the following queries are semantically correct:
(a) SELECT r.type, r.price FROM Room r, Hotel h WHERE r.hotel_number = h.hotel_number AND h.hotel_name = ‘Grosvenor Hotel’ AND r.type > 100; (b) SELECT g.guestNo, g.name FROM Hotel h, Booking b, Guest g WHERE h.hotelNo = b.hotelNo AND h.hName = ‘Grosvenor Hotel’; (c) SELECT r.roomNo, h.hotelNo FROM Hotel h, Booking b, Room r WHERE h.hotelNo = b.hotelNo AND h.hotelNo = ‘H21’ AND b.roomNo = r.roomNo AND type = ‘S’ AND b.hotelNo = ‘H22’;
When you want to create a polished printout of some or all of the data in your Access database, you can create a(n) ____________________.
Fill in the blank(s) with the appropriate word(s).
To remove multiple elements using the unset() function, you must separate each element name with a ____________________ .
Fill in the blank(s) with the appropriate word(s).
Ping uses ICMP __________ packets to request a response from another computer to verify whether it's available for communication.
Fill in the blank(s) with the appropriate word(s).