题目内容：

The GUARANTEE ON THIS WATER HEATER IS IN EFFECT ONLY WHEN THE HEATER IS INSTALLED AND OPERATED IN ACCORDANCE WITH THESE INSTRUCTIONS. READ THESE INSTRUCTIONS THOROUGHLY BEFORE STARTING.

LOCATION:

　　Select a location accessible to water lines and power supply. Do not locate the heater where water lines could be subjected to(受…影响) freezing temperatures. It is recommended that the heater be located near the center of greatest hot water usage to prevent heat loss through the pipes.

ELECTRICAL CONNECTIONS:

　　Before any electrical connections are made, be sure that the heater is full of water and that the valve(阀门) in the cold water supply line is open.

OPERATION

When the switch is closed, the operation of this electric water heater is automatic. The thermostats are preset to the "HOT" setting to provide a water temperature of approximately 120oF to reduce the risk of being burnt.

MAITENACE

Shut off the electric power whenever the water supply is turned off.

Shut off the electric power, water supply and drain the heater completely to prevent freezing whenever the building is left unoccupied during the cold weather months.

SERVICE

The trip–free devices on this heater will cut off all power if temperature of water is above 190F. If there is no hot water after a reasonable period of time, check the main fuse(保险丝) box. In the event that the fuses have not blown, call a serviceman.

72.The location of the water heater shall ___________.

A. be close to water lines and power supply

B. be subjected to low temperature

C. be in the centre of the house

D. have a longer distance to hot water usage.

73.Before any connection of power , make sure that one thing you have to do is _____.

A. to have the heater in the water     B. to open the cold water inlet valve.

C. to shut off the thermostats         D. to replace wiring diagram

74.When you are not using the heater in winter months, it is better for you to________.

A. have the tank full of clear water    B. drain the heater

C. to leave it untouched             D. prevent it from losing heat

75. What will happen to the heater when the temperature of water is above 190F?

A. it will cause damage         B. It will break off automatically.

C. It will produce cold water.    D. It will blow the fuse.