Final answer:
Squeezing or heaving can occur even when shoring or shielding has been properly installed, so the statement is true. These injuries may occur following a strong blow to the shoulder or a hard fall onto an outstretched hand.
Step-by-step explanation:
Squeezing or heaving can occur even when shoring or shielding has been properly installed, so the statement is true. Shoring and shielding are safety measures used in construction to prevent accidents and protect workers from falling objects or collapses. However, they may not provide complete protection against all types of forces or accidents. For example, if there is a sudden and strong impact, such as a powerful blow to the shoulder or a hard fall onto an outstretched hand, the force exerted on the body may still cause squeezing or heaving injuries to the pectoral girdle.