Main sewers are installed with ____________________ to define the alignment and slope.
Fill in the blank(s) with the appropriate word(s).
ANSWER: lasers
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Never assume that a ____________________ indicated means a part must be replaced.
Fill in the blank(s) with the appropriate word(s).
A normally closed push button ____.
a. is generally used to represent a start button b. has only one pole c. is generally used to represent a stop button d. is referred to as common
A half-wave, single-phase ac-to-dc converter is loaded by an impedance of l0 mH inductance in series with l0 ? resistance. The ac voltage is 110 v (rms). For ? equal to 30o and 90o , calculate the following:
? = ° 10 , assuming that a freewheeling diode is used. a. Conduction period b. Average current of the load c. Average voltage of the load d. Power
Which groups in European society benefitted most from the effects of the plague?
a. farm workers and urban wage earners b. lords and monks c. clerics and knights d. kings and lords