68. Which of the following statement is incorrect？ (A)Roller, twist, or triangular drill bits shanks should only be used in a drill press chuck. (B)The blade on the portable circular saw should be aligned on the waste side of the marking line when making a cut. (C)Press your wood against the upward moving side of the disc while using the Disc Sander. (D)When installing a blade of a scroll saw, ensure the teeth point downward.