Attempts to leach the excess salts from a saline-sodic soil resulted in a marked reduction of crop yields. To what is this most likely due?
A) removal of Ca2+ and Mg2+ ions from the exchange complex
B) increase in percentage sodium saturation
C) increase in the soil pH
D) increase in the Al3+ concentration
E) deficiency of iron and manganese
B
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The ____ stage in an electrical installation is when the raceways, cable, boxes, and other electrical equipment are installed.
a. build b. rough-in c. wiring d. code
Sketch a simple hydraulic circuit using ANSI symbols that include the following: reservoir, pump, pressure relief valve, four-way, two-position solenoid valve, double acting cylinder, and spring loaded accumulator. The four-way, two-position, solenoid valve will be used to reverse the direction of travel for the double acting cylinder and the accumulator will insure the cylinder does not creep once in the extended position. The pressure relief valve will ensure the system does not exceed application requirements. Note: Addition of a check valve above the pump as shown in the circuit below will ensure that the double acting cylinder will not creep even with the loss of pump output.
What will be an ideal response?
Among smartphone users, 40% use a case but no screen protector, 10% use a screen protector but no case, 45% use both a case and a screen protector, and 5% use neither a case nor a screen protector. Twenty smartphone users are sampled at random. Let 
be the respective numbers of users in the four given categories.
How are clamp-on ammeters used?
A) They are clamped around one of the power wires feeding the circuit. B) They are clamped onto the load. C) They are clamped around both power wires feeding the circuit. D) They are clamped to the case of the unit.