Which of the following are precautions specific to arc welding on a construction site?
A. Construction personnel should use only manual electrode holders.
B. All parts that carry current should be properly insulated against the maximum voltage.
C. Cables must be properly insulated and flexible.
D. All of the above
Question 2
Which of the following statements are true?
A. Pneumatic tools that operate at pressures in excess of 100 pounds per square inch must be equipped with a special protective device.
B. If compressed air is used for cleaning purpose on anything other than concrete forms, the compressed air pressure must exceed to more than 30psi.
C. When a power-actuated tool misfires, it should not be held in the operating position.
D. When storing oxygen cylinders, keep them at least 10 feet away from combustible materials and compressed gas cylinders.
Biological anthropologists map skeletal remains from a prehistoric site.
The first step in field recovery involves surveying the site, sometimes with special equipment.
Active site of rubisco
Possible mechanisms for alternative splicing by splice-site selection
Specific amino acid–nucleotide contacts for cI and Cro repressors
Construction of cDNA libraries